Alright, let's work through 3955 times 1709 step by step
3955 × 1709 = 1709 × (3955)
+ 1709 × 5 giving us 8545
+ 1709 × 50 giving us 85450
+ 1709 × 900 resulting in 1538100
+ 1709 × 3000 giving us 5127000

= 6759095
